INT 2F - CD-ROM - ABSOLUTE DISK WRITE
AX = 1509h
ES:BX -> buffer
CX = drive number (0=A:)
SI:DI = starting sector number
DX = number of sectors to write
Note:   corresponds to INT 26h and is currently reserved and nonfunctional

See also: 2F1508

2F1509 - CD-ROM - ABSOLUTE DISK WRITE